References for the basic material used here are papers [1]} and [2]} of Morton Brown.
It follows from results of those papers that a locally flat embedding of a disk is the same as a tame embedding of that disk in the sense that the latter phrase (which e.g. is found in [3]}) is used elsewhere in this paper.
His collaboration
[4]} (summarized in [5]}) with Herman Gluck forged the link
which stimulated the interest in
the deep results on which the theorem above depends.
